Yes the coco does require feeding and can be a dificult creature to keep thriving. They are considered to be one of the hardiest tube dwellers you could find but that is providing they get enough nourishment. Finely minced raw seafoods fortified with a good quality marine vitamin are best. >>Here
<< is a good thread to reference for that.
They also grow from hard calcerous tubes, rather than the slime/detritus ones like "dusters". Proper water chemistry should be maintained to ensure healthy growth.
When feeding these types of animals I find encompasing them in a feeding apparatus makes life much easier. I have attached a pic of the one I use for the corals I need to feed regularly as some need more "TLC" than others. Not my original idea, but borrowed
, still a great contraption.